Internally stimulated optical parametric oscillator/laser

An optical parametric oscillator/laser comprising:

• a pump source for generating pump radiation;
• an optical parametric oscillator/laser crystal responsive to pump radiation to generate laser radiation and responsive to laser radiation to generate parametric optical radiation;
• a first end surface located at a first end of the crystal which internally reflects laser radiation and parametric optical radiation, wherein the first end surface is formed from first and second adjacent reflective surfaces;
• a second end surface located at a second end of the crystal, said second end surface being formed from third and fourth adjacent reflective surfaces which internally reflects laser radiation and parametric optical radiation, wherein the second end surfaces is an output and is at least partially reflective at an output wavelength.

An optical parametric oscillator/laser comprising:

• a pump source for generating pump radiation;
• an optical parametric oscillator/laser crystal responsive to pump radiation to generate laser radiation and responsive to laser radiation to generate optical parametric oscillation radiation;
• a first end surface located at a first end of the crystal which internally reflects laser radiation and optical parametric oscillation radiation;
• and
• a second end surface located at a second end of the crystal which internally reflects laser radiation and optical parametric oscillation radiation, wherein said second end surface is an output surface, and said second surface is partially reflective and partially transmissive to at least one of the optical parametric oscillatin wavelengths.